Qiu M.,shanxi Railway Vocational Institute |
Jiang A.,Xiamen Rail Transit Group Ltd Corporation
Modern Tunnelling Technology | Year: 2013
In light of the principles of fluid mechanics, the limit equilibrium method, and the rheological behavior of rock mechanics, a method for calculating backfill grouting pressure and the flow characteristics of grout distribution are discussed. The grout pressure distribution was analyzed using the Newtonian fluid model and the Bingham fluid model, and a formula for horizontal grouting pressure distribution was deduced and an empirical formula for grouting pressure is put forward in this paper. Based on engineering practice, a comparative analysis was carried out regarding the Newtonian fluid model, the Bingham fluid model, and the empirical formula. The results show that the grout pressure distribution solution deduced from the Newtonian model is a special case of that deduced by the Bingham model; the grout pressure distribution is related to such factors as grouting pressure, shield tail void, driving speed, and grout property. The deduced grout pressure distribution model presented can be applied to concrete engineering calculations.